volts frequency and turns

Thread Starter

itsme03

Joined Nov 10, 2008
2
i know there is a formula for this but i don't know what it is.

assume that a 120 volt, 25 cycle magnetic coil is to be rewound to operate properly on 60-cycles at the same voltage. if the coil at 25-cycles has 1,000 turns, at 60-cycles the number of turns should be most nearly what?

the answers 416, but how?
 
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